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NEWTOWN, CT - JANUARY 14:  Nelba Marquez Greene and her husband Jimmy Green whose daughter Ana Grace Marquez Green (age 6 in photo), was killed in the Sandy Hook massacre, hold hands during a press conference on the one month anniversary of the Newtown elementary school massacre on January 14, 2013 in Newtown, Connecticut. Eleven families of Sandy Hook massacre victims came to the event one month after the shooting to give their support to Sandy Hook Promise, a new non-profit with the goal of preventing such tragedies in the future.  (Photo by John Moore/Getty Images)
NEWTOWN, CT - JANUARY 14:  Nelba Marquez Greene and her husband Jimmy Green whose daughter Ana Grace Marquez Green (age 6 in photo), was killed in the Sandy Hook massacre, hold hands during a press conference on the one month anniversary of the Newtown elementary school massacre on January 14, 2013 in Newtown, Connecticut. Eleven families of Sandy Hook massacre victims came to the event one month after the shooting to give their support to Sandy Hook Promise, a new non-profit with the goal of preventing such tragedies in the future.  (Photo by John Moore/Getty Images)

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Titulado "Las noticias del mañana", este video muestra las posibles señales de alerta tempranas de un tiroteo masivo.

Familias de Sandy Hook publican un espeluznante video de advertencia

Titulado "Las noticias del mañana", este video muestra las posibles señales de alerta tempranas de un tiroteo masivo.